Clare Island Survey — Marine Algae. 15 3 



'08), kindly sent me by the author, possesses thirty records of algae. Co. 

 Gal way, on the other hand, which forms sub-division C 1, has a much longer 

 list, owing to the collections made at Roundstone Bay. For the tliird sub- 

 division, C 3 (i.e., counties Sligo and Leitrim), there are practically no records. 



"With regard to sub-division C 2, Wm. Thompson, the zoologist, collected 

 a few plants in Clew Bay about 1840 ; and Harvey quotes one record — 

 Asperococcus bullosus— in " Phycologia Britannica." In a report of a natural 

 history excursion to Achill at Easter, 1898, H. Hanna deals with the marine 

 algae (Hanna, '98). He records twenty species ; and this constitutes the only 

 account of the sea-weeds of the area. Adams, in his list, adds nine names to 

 the flora of the sub-division, culled from various sources. A single species 

 has been recorded from Clare Island, namely Codium tomentosum (vide 

 H. H. Dixou, Ann. Bot., xi, p. 590). 



The Roundstone records date from 1808. Fucus Mackaii was described 

 from that locality by Dawson Turner (" Historia Fucorum," PI. 52) ; and it 

 still remains one of the few stations for the plant in Ireland. In addition to 

 the discovery of this species, Mackay noted the presence of Rhodochorton 

 floridulum, which Harvey mentions in the chapter on algae in Mackay's 

 " Flora Hibernica." McCalla's records follow. He thoroughly explored the 

 shore, and supplied Harvey, as the pages of " Phycologia Britannica " testify, 

 with much valuable material both from Roundstone Bay and Birturbuy Bay. 

 McCalla was also one of the pioneers of dredging amongst algologists, and by 

 this method he obtained many interesting species. He commenced to issue 

 a set of " Algae Hibernicae," but, owing to his untimely death in 1849, only 

 two volumes were published. Harvey visited Roundstone at least once, and 

 in later times, Johnson ('93) and H. Hanna. Foslie also, the well-known 

 specialist on calcareous algae, came over from Norway on purpose to 

 investigate the Lithothamnia which had been described from Roundstone by 

 McCalla and Harvey. An account of his trip was published in the "Irish 

 Naturalist " ('99, p. 175). Foslie was keenly interested in the Lithothamnia 

 of the British Isles, and it was proposed to send him for identification all the 

 Clew Bay material. His premature death in 1910 came as a great shock. 

 Three days were spent by me at Roundstone in September, 1911, and, with 

 the exception of Codium amphibium, all the species for which that locality is 

 famous were seen in their natural habitat. The total number of species listed 

 by J. Adams for the sub-division CI is 162. 



Outside the province of Connaught, Valencia Harbour (in the extreme 

 south-west) has been specially investigated by biologists, and Weiss, who dealt 

 with the algae ['00], gives a list of eighty-six species collected by him during 

 August and September, 1896, with notes on the same. 



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